I have MOD video file. My LG TV doesn't support MOD. How can I convert MOD video file without loosing quality to modern video format to watch it on different modern TVs?
A typical video file is a container for video data. The video data itself is compressed by some codec. You therefore have to distinguish between the container format and the video codec. For a correct answer you should tell the codec type of the video data in your file. You find lots of information about your video file by
If the codec is one that is understood by your TV, you can repack your video data into another container format with
ffmpeg -i yourfile.MOD -c:copy out.mp4
Or whatever container format you desire. On the other hand if the codec of the MOD file is not understood, you must recode your video data which necessarily incurs losses on the video quality. For that case refer to any tutorial about transcoding.